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I didn't know what that was I first thought it was a jewlery ! Now I see from the comments that it's Jelly fish ! Brrr I saw a lot in the red sea, but fortunately they were harmless. Here in the North Sea they are dangerous.

I couldn't figure it out, either. I thought it was some kind of shell. My daughter received a nasty sting just last week in the gulf somewhere in Alabama near Florida. Got her right under the butt! Said it felt like being stung by bunches of bees! Not fun at all...